MSI Ventus RTX 4080 16G Broadview schematic needed

[Thetechdude]

Hi guys, I'm working on a MSI Ventus RTX 4080 16G. The GPU has 12v, 5v, however what I assume is the 1.8v rail has 1.1v and what I assume to be PEX is 0v. As you may have guessed already there is no Vmem and no Vcore.

I have looked around in related forum posts for a schematic so Much appreciated if anyone can share a Broadview schematic.

Thanks.

[Thetechdude]

Semi-resolved

Swapping core on a new PCB was the fix for this one. Unfortunately not sure what the actual issue was beyond that

[duck.dodgers]

HI,

I don't have schematic, but your case seems relatively simple. First of all check resistance on this 1V8 rail, if it isn't overloaded. If not, check 1V8 driver voltages (should be 5V VCC and 12V VIN) - if proper voltages are present, replace the driver. If it still won't help, the culprit will be resistor divider on FB circuit. There are tons of schematis and boardviews of RTX20xx/30xx/40xx series cards here on Badcaps, I'm sure you'll find at least one with exactly the same 1V8 DC/DC converter as yours.

Regards

[duck.dodgers]

Hint - if your 1V8 driver is GS9216/GS9219/AOZ2261 (I bet it's one of them), check GV-N3080EAGLE schematic and corresponding BV for instance

[duck.dodgers]

Sorry, but I've just realized I could have misled you. It's because the best card I had for repair so far was RTX 3090Ti and I haven't had a chance to put my hands on any 40xx card yet. Looking at some RTX4080/4090 schematics I've noticed a slight change, namely for Ada Lovelace architecture proper voltage is 1.2V instead of 1.8V. I don't know how accurate your multimeter is and what range you've chosen for measurement, so 1.1V may be perfectly fine and the problem lies somewhere else.

In that case I would suggest to check power sequence, especially if 1V8/1V2 controller is setting PS_GA1V8_NP1V2_PGOOD signal (pin #1 if it's GS9216/GS9219/AOZ6621) and if so, then in next step if NVVDD controller is powered and enabled (if it's uP9512 then should be 5V at pin #12 and pin #36 has to be in logic high state)

[ro.man]

Hi guys, I'm working on a MSI Ventus RTX 4080 16G.

If any one still needs it - this mixture could help...

[Thetechdude]

Semi-resolved

Swapping core on a new PCB was the fix for this one. Unfortunately not sure what the actual issue was beyond that